216715021161 has 4 divisors (see below), whose sum is σ = 288953361552. Its totient is φ = 144476680772.

The previous prime is 216715021091. The next prime is 216715021207. The reversal of 216715021161 is 161120517612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216715021161 - 2²¹ = 216712924009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216715021261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36119170191 + ... + 36119170196.

It is an arithmetic number, because the mean of its divisors is an integer number (72238340388).

Almost surely, 2^216715021161 is an apocalyptic number.

It is an amenable number.

216715021161 is a deficient number, since it is larger than the sum of its proper divisors (72238340391).

216715021161 is an equidigital number, since it uses as much as digits as its factorization.

216715021161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72238340390.

The product of its (nonzero) digits is 5040, while the sum is 33.

Adding to 216715021161 its reverse (161120517612), we get a palindrome (377835538773).

The spelling of 216715021161 in words is "two hundred sixteen billion, seven hundred fifteen million, twenty-one thousand, one hundred sixty-one".